Pole figures 111 and 222 of annealed high purity silver samples with a strong texture were measured with X-ray diffraction in order to estimate secondary extinction influence on texture determination. Since both pole figures arise from the same planes, and lower index reflections are more strongly affected by extinction, differences of pole densities between both pole figures should be attributed to this phenomenon.

Samples were first slightly rolled and then heated to 600ºC through a ramp rate of 300ºC/h and kept at this temperature for 4 hours. Then they were 91.5% cold rolled and heated to 800ºC through a rate of 600ºC/h and kept at this temperature for 4 further hours. As a result a strong one component texture was obtained.

Maximum pole densities of pole figure 222 were about 25% higher than those of pole figure 111, as expected when extinction is present. In order to rule out that this difference comes from primary extinction, the sample was slightly hammered out and then measured again, delivering similar results.

Conventional mosaic crystal extinction correction techniques were applied to obtain the true maximum pole densities. Corrected maximum pole density was about 39% higher than the one of pole figure 111 and about 9% higher than that of pole figure 222.

However secondary extinction parameter g resulted about 10⁵ which implies an average crystallite orientation deviation of about 1 second of arc. This seems not consistent with the width of the texture peak which has a broadening of about 1º. Although no clear argument could be made for this result, it could be interpreted in the following way: the beam diffracted from the strong textured polycrystal can substantially be diffracted again out of the detector direction, only by a second crystallite with a very close orientation to the first diffracting crystallite.

Anyway it is clear that the conventional correction for mosaic crystals should be improved to be applicable to textured polycrystals.

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